Sewing machine



J. C. RINGE.

SEWING MACHINE.

APPLICATION FILED JUNE 13. 1s1a Patented Jan. 17, 1922.

INVENTOR L/0/m C/fi/Wf.

ATTORNEY 2 SHEETSSHEET 1.

WITNESS data 42% J. c. HINGE.

SEWING MACHINE.

Z SHhETS-SHEET 2- WITNESS INVENTOR L//m C/F/Ai ATTORNEY Patented Jan. 17, 1922.

UNITED STATES PATENT OFFICE.

JOHN C. HINGE, OI S'IBATFOBD, CONNECTICUT, ASSIGNOR TO THE SINGER MANUFAC- TUBING COMPANY, A CORPORATION OF NEW JERSEY.

SEWING MACHINE.

vTo all whom it may concern:

Be it known that I, JOHN C. RINGE, a citizen of the United States, residing at Stratford, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Sewing Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvements in sewing machines and more particularly in sewing machines employing loop-takers to cast needle-thread loops around threadcases having only a limited movement on their own axes.

The invention has for its primary object to improve the constructions heretofore employed to effect an unobstructed passage for the needle-thread loop in its travel around the thread-case, in so far as said needlethread would meet with interference or resistance by the means used for limiting the rotation of said case.

In accordance with the present improved construction, the thread-case is as usual rovided with a circumferential rib seate in an annular raceway in the body of the looptaker and with a stop-notch adapted to be entered by one end of a stationary restraining arm. The normal tendency of the thread-case is to rotate with the loop-taker and to therefore cause one of the walls of said notch to constantly bear against the restraining lug and consequently obstruct the thread-loop passage. In order to open this passage at the proper intervals, the threadcase is provided with a shoulder, in the present instance arranged diametrically opposite to the stop-notch and adapted to be intermittently engaged by a finger on 3. vibrating arm actuated from an eccentric on one end of a rotary shaft journaled beneath the cloth-plate. The opposite end of the rotary shaft carries a peripherally grooved Specification of Letters Patent.-

-.lpp1icat1on filed June 13,

Patented Jan. 17, 1922. 1913. Serial Io. 239,720.

of a sewing machine embodying the present improvement. Fig. 2 is a sectional view on the line av-w, Fig. 1. Fig. 3 is a front end elevation of a portion of the sewing machine, omitting the overhanging arm and showing the normal relation between the restraining arm and the stop-notch on the thread-case. Fig. 4 is a view similar to Fig. 3 butshowing the thread-case in the position it occupies during the drawing up of the thread-loo prior to setting the stitch. Fig 5 is a detail vertical sectional view of the loop-taker and the vibrating arm.

Referring to the drawings, the sewlr-g machine is constructed with a cloth-plate 1, from which rises the hollow standard 2 of the overhangin bracket-arm 3 terminating in the head 4. ounted for vertical reciprocation in the head 4 is the needle-bar 5, carrying the needle 6 and adapted to be actuated in the usual manner from the main or driving shaft 7. The presser-bar 8 carrying the presser-foot 9 is also mounted for vertical reciprocation in the head 4.

Carried by the driving shaft 7 is a driving pulley 10 provided with a plurality of axially extending spaced peripheral grooves, as 11, entered by spaced cleats, as 12, on a driving belt 13. Journaled beneath the cloth-plate of the sewing machine is a 1'0- tary shaft 14 carrying a driven pulley 15 of substantially the same size as the pulley 10 and provided with similar grooves, as 16. The driving belt 13 connects the pulleys 10 and 15 and in its travel contacts with the periphery .of a driven pulley 17 carried by the rotary loop-taker shaft 18 and provided with a plurality of grooves, as 19, succes sively in alinement with the grooves 16 of the pulley 147- The pulley 17 is located outside the paths of travel of the belt, intermediate the pulleys 10 and 15 and closely adjacent to the latter, so that each of the cleats 12 on the belt simultaneously engages alined grooves in the driven pulleys, thereby formin adapted to rotate each of said driven pulleys with the positively timed relation and the same degree of effectiveness as a geardrive. The location of the pulley 17 outside the paths of travel of the belt imparts thereto revolutions in a direction opposite to the direction of rotation of the pulleys 10 and 15. In the present embodiment of the invention, the pulley 17 is of a size such that it is rotated twice for each rotation of the pulleys l0 and 15. (Tarried by the rotary shaft 18 is the loop-taker 20 having a cup-shaped body provided with a loopseizing beak 21 and a central recess for the reception of the thread-case 22, which is formed with a peripheral bearing rib 23 seated in an annular raceway 24 in the body of the loop-taker. Adjacent the loopseizing position of the beak 21. the threadcase is formed in its front face with a notch 25 of which the side walls 26 and 27 loosely embrace the extremity of the restraining arm 28 suitably secured upon the under face of the bed-plate;

.-\t a point substantially diametrically opposite the notch 25 the thread-case is provided with a projection 29 affording a shoulder or abutment adapted for engagement by a finger 30 upon one end of an operating element 31 formed at its 0pposite end with a strap 32 embracing an eccentric portion 33 of a collar 34 secured by set-screws, as 35, upon the shaft 14. Intermediate its ends the element 31 is pivotally connected by means of a pivot pin 36 with one end of a fulcrum-arm 37 pro-- vided with a bearing sleeve 38 entered by an eccentric stud 39 adjustably secured 1n position by means of the set-screw 40.

In operation, the slight frictional contact between the thread-case and the body of the loop-taker is sufficient to urge the thread case to accompany it in its rotation and to cause the wall 27 of the notch 25 to engage the restraining arm 28. This is advantageous during a portion of a stitchforming cycle in that thereby an opening is formed between the wall 26 and the restraining arm 28 for the passage of the limb of the needle-thread loop cast about the outer face of the bobbin-case, this limb entering said passage when the loop-taker approaches the completion of a semi-rotation following the seizure of the loop. At this time the finger 30 is clear of the projection 29 and permits the limb of thread to pass therebetween. The loop of thread is now drawn off the loop-seizing beak and drawn up by the usual take-up of the machine. In order to permit the outer limb to readily pass between the restraining arm 28 and the wall 27, the thread-case is slightly oscillated in a direction opposite to the direction of rotation of the loop-taker by the action at this time of the finger 30 upon the projection 29. The vibrating finger 30 of the present construction is not dependent upon a mechanism of the ma-' chine requiring adjustment, such as the feed-mechanism for instance, but by its direct and positive connection with the actuating shafts of the machine remains in absolute timing with respect to the rotation of the loop-taker. The present improvement further requires only the use of a single driving connection between the upper and lower shafts of the machine for operating separate elements, i. e. the loop-taker an the opening finger, and is therefore particularly adapted for high speed machines.

The adjustable fulcrum for the finger 30 provides means for varying the time of opening of a passageway for the threadloop as well as a corresponding variation in the size of the opening for accommodating different kinds or sizes of thread.

Having thus set forth the nature of the invention, what I claim herein is' 1. In a sewing machine, the combination with a reciprocating needle, a rotar needleactuating shaft, a rotary loop-taher provided with a bobbin-case held against rotation in the direction of the latter, a movable finger acting on said bobbin-case, a rotary loop-taker actuating shaft having a plurality of rotations to one of said needleactuating shaft, and a bobbin-case finger controlling shaft, of a single belt drive for giving to said loop-taker actuating shaft rotary movements in a direction opposite to that of said needle-actuating shaft'and to said finger-controlling shaft rotarymovements in the same direction.

2. In a sewin machine, the combination with a rotary doo p-taker formed with a thread-cavity, a loop-taker actuating shaft, a thread-case journaled in said loop-taker, and means for restraining said thread-case against rotation with said loop-taker, of a movable finger adapted to turn the threadcase in a direction opposite to the direction of rotation of said loop-taker, an actuating shaft for said finger, and a single belt for directly driving both of said actuating shafts in reverse directions.

3. In a sewing machine, the combination with a rotary loop-taker formed with a thread-cavity, a loop-taker actuating shaft, a thread-case journaled in said loop-taker, and means for restraining said thread-case against rotation with said loop-taker, of a movable thread-finger adapted to turn the thread-case in a direction opposite to the direction of rotation of said loop-taker, a rotary shaft, means for actuating said finger from said shaft including an eccentric, a

belt-pulley upon each of said shafts, and a single belt engaging both of said pulleys for rotating said shafts.

4. In a sewing machine, the combination with a reciprocating needle, a needle-actuating shaft carrying a belt-pulley, a rotary loop-taker having a 'threadcase journaled therein and restrained against rotation with said loop-taker, and a loop-taker actuating shaft carrying a belt-pulley, of a movable finger adapted to turn the thread-case in a direction 0 posite to the direction of rotation of sai loop-taker, a rotary actuating shaft forsaid finger, a belt-pulle carried by said finger-actuating shaft an e a single driving belt connecting all of said pulleys.

5. In a sewing machine, the combination with a reciprocating needle, a rotar needleactuating shaft, a rotary loop-ta er provided with a bobbin-case held against rotation in the direction of the latter, a movable finger acting on said bobbin-case, a rotary loop-taker actuating shaft having a plurality of rotations to one of said needleactuating shaft, and a bobbin-case finger controlling shaft, of a single belt drive carried by said needle-actuating shaft for giving to said loop-taker actuating shaft rotary movements in a direction opposite to that of said needle-actuating shaft and to said finger-controlling shaft rotary movements in the same direction.

6.In a sewing machine, the combination with a reciprocating needle, a rotary 1oop-' taker, actuatin shafts therefor carrying driving and driven pulleys, a thread-case journaled in said loop-taker, means for restraining said thread-case against rotation with said loop-taker, and a movable finger adapted to turn the thread-case in a direction opposite to the direction of rotation of said loop-taker, of means for actuating said finger including a rotary shaft, a pulley carried thereb a driving belt connecting all of said pul eys, and drivin elements interengaging the loop-taker s aft pulley and the pulley on the finger-actuating shaft for positively driving the same in uniformly timed relation.

7. In a sewing machine, the combination with a reciprocating needle, a rotary looptaker, a thread-case journaled in said loop- -taker and restrained against rotation there-' JOHN C. RINGE. 

